Hot meltAdhesiveis a solvent-free Or water-based solid adhesive based on thermoplastic polymer,, span>It melts when heated, adheres to the adherend, solidifies after cooling, and has a certain adhesiveness combined strength.
Hot melt adhesive has many advantages: fast curing speed (approximately Required1seconds), so it can be used continuously; no solvent is needed, and packaging, storage and transportation are simple;The melting temperature is generally only 150-200℃,Low processing costs; can bond polyethylene that is difficult to bondhydrocarbonMaterials, etc.
hotSolutionGlue Widely used in packaging, book binding, shoemaking, makingGluing, pasting or sealing of clothing, wooden furniture, plywood, can making, etc.
The hot melt adhesive used in large quantities is thermoplastic vinyl-Vinyl acetate copolymer resin（EVA）An adhesive system based on a small amount of other resins, Its component system Made of ethylene-vinyl acetate copolymer resin and modified resin, tackifierAgent, viscosity adjustment Agent, antioxidantOxygen agent, inorganic fillers and plasticizerAgentetc.
Due toEVA Poor heat resistance and cold resistance, heatstablePoor quality, limits its scope of use, so there are products based on other synthetic resins. Hot melt adhesive, the current introduction is as follows下注：
（1)JuacylAmine hot melt adhesiveAgent The main component is polyamide resin. It includes two major categories:One type is commonly known as nylon, and the other type is composed of dimers or trimers of plant fatty acids or esters and organic amines (such as ethylenediamine, polyethyleneenePolyamide formed by the condensation of polyamines, etc. ,The molecular weight is500 ~Between 900, usually called low molecular polyamide.
Use nylon12 resin as hot melt adhesive and epoxy resin as base glue, which can be used as aircraft structural adhesive.
Solid low molecular polyamide, such as domesticM-Solid low molecular polyamide, which is formed by the condensation polymerization of dimer tung oil ester or linoleate and polyethylene polyamine. This type of hot melt adhesive has better heat resistance and bonding properties than EVAEVA Hot melt adhesive is preferred for bonding leather or metal.
(2) Polyester hot melt adhesive The resin used is mainly polyester EthylenediphthalateAlcoholEster and polybutylene terephthalate. The former is used for fiber, filmand corrugated board, etc. Bonding of general materials, the latter used in the automotive and electrical industries. This type of glue has high heat resistance, impact resistance, and excellent electrical insulation properties. It is especially suitable for the assembly of electrical and automotive components.
(3) Hot melt sealing adhesive UseEVA4030 parts, cross-linked butyl rubber30 parts, butyl phenolic 20 parts of resin, 5 parts of stabilizer, and 5 parts of calcium carbonate form heatMelt Sealing adhesive.
This type of adhesive is an elastic sealing material after melting , mainly used for edge sealing of double-glazed window frames in houses and greenhouses,It plays a great role in saving energy.
（4) LiSub-bonded polymerCompound adhesive YieneUnsaturated with methacrylic acid etc.Carboxylic acidAcid copolymer, and a thermoplastic polymer cross-linked by metal ions is called an ionomer. Mix it with butyl rubber and ethylene-propylene rubberand, Add organic peroxide for reaction to generate ethylene–VinegarSimilar to vinyl acid copolymer resin, with hot melt flowSexy and elastic materials. It can be made using it as a base materialheatMelt the adhesive and process it into a film or sheet for use. This type of adhesive also has good heat resistance and resistance to It has thermal creep properties and has good adhesion to metals and plastics. It can be used in light industries such as automobile manufacturing, leather processing and shoemaking.
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(4) Li Subbond polyCompound adhesive With BeneUnsaturated with methacrylic acidCarboxylic acid Acid copolymer, a thermoplastic polymer cross-linked by metal ions, called an ionomer. Compare it with butyl rubber and ethylene-propylene rubbermixedand,Add organic peroxide for reaction to generate ethylene–vinegar Similar to vinyl acid copolymer resin, it has hot melt flowabilityWith elastic material. It can be made using it as a base materialheatMelt the adhesive and process it into a film or sheet for use. This type of adhesive also has good heat resistance and resistance to It has thermal creep properties and has good adhesion to metals and plastics. It can be used in light industries such as automobile manufacturing, leather processing and shoemaking.
